Set Date Field To Null Value?

Dec 12, 2011

I am using visual studio 2010. I have a text box bound to a sql datetime field.I have to be able to either set or clear the text box.  I can set it to any date fine, but when I try to clear it I am unable to save the record.i am using the binding navigator to save.


.net - Checking For Null In Date Field?

Oct 25, 2011

I have an ASP.NET application that crashes when a null date value is returned.

The code line is:

excelWorksheet.Cells("A" & xlRowCounter).Value = IIf(IsDBNull(dRow("sysdate")), "", Format(dRow("sysdate"), "MM/dd/yyyy"))

Error message:

ERROR: System.ArgumentException: Argument 'Expression' is not a valid value.

How would I check for a null date, and replace it with "" in my app ?

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Insert Null Value In Date Field?

Nov 22, 2010

i have a maskedtextbox which will accept only date in the format of "DD-MM-yyyy" no i want to insert this date in my db. i have done this successfully.

Now i want to insert null value in through that maskedtextbox .

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Setting Date Field To Null With DataTables?

Mar 31, 2010

Im writing an app which connects to a SQL Server database, via datasources / datatable.When Im looking at my .xsd I can see DataTables containing DataColumns. Each DataColumn has a 'NullValue' property which defaults to '(Throw exception)'.Because I have nulls in my tables I have gone through the fields and set all System.String fields to NullValue = 'Empty', System.int32 field to NullValue = 0.

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VS 2005 What Approach For Passing Null Value To Date Field

Mar 25, 2009

i'm not 100% sure about sql server but i think it doesn't accept null value for date type columns but in oracle, a date column can accept a null value. and since i'm using oracle, this is causing some problems because in my form, a textbox item bound to a date column will not accept a null value. reading thru some threads, it would seem that it is not possible to pass a null value to a date type in .Net.


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VS 2008 - Default Date Versus Null Field

Aug 26, 2011

I have the following
If Trim(txtConfirmationDate.Text) <> "" Then
sqlinsert2.Parameters.AddWithValue("@CONFIRMDATE", CDate(txtConfirmationDate.Text))
sqlinsert2.Parameters.AddWithValue("@CONFIRMDATE", VB.vbNull)
End If
Unfortunately, it writes "01/01/1900" to the database. How do I get it to just leave the field as NULL?

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VS 2008 DateTimePicker To Be Blank If DATABOUND Date Field Is Null?

May 4, 2009

How can I get this to happen? I googled around and it seems setting the CUSTOM FORMAT to " " when the field is null will work but not for a BOUND datetimepicker.

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Retrieve NULL Field [ Date Out ] In Sql 2005 Database To A Grid View In ASP.Net.?

Mar 13, 2009

How can i retrieve NULL Field [ Date Out ]in sql 2005 database to a Grid View in ASP.Net. I need this field to be edited by the user.

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Check If A Field In A Data Table Is Null Before Creating A Textbox Bound To That Field?

Feb 24, 2010

I am building a data based application using VB 2008 an SQL Express. I need to create textboxes on my form using code, (With & End With) method. I need a simple code string that will allow the app to check if the field to wich the textbox wil be databound is Nul, If so the textbox will not be created.

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Checking A Date Field - Existing Textbox That Is Automatically Filled With The Current Date?

Feb 21, 2011

I'm fairly new to ASP.NET & VB.I've been asked to take an existing textbox that is automatically filled with the current date and allow the user to either add a "+" or "-" and a number or a spcific number and convert that into a date.I underdstand the basic concept on how to do this, but I'm running into some problems using the proper commands in order for this to work.The Textbox is called txtDate.What I've tried to do is this:

If txtDate = '+' Or '-' Then
DateAdd("d", txtDate, today)
End If

Here is what the whole thing looks like:

sender As[code].....

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Filter The Data In The Date Column To Show Only The Records That Don't Have A Date Entered Into The Field?

May 13, 2010

I have an access form that shows a data table. when the form is opened, I want to filter the data in the date column to show only the records that don't have a date entered into the field.

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C# - Changing Date Format From Date Field In Database?

Dec 14, 2009

I am using ASP.NET with SQL Server 2005.

My date get saved in the database with data type = "smalldatetime".

I am displaying the date value into a text box called txtDate with a Reader......

Dim conn As Data.SqlClient.SqlConnection
Dim Comm As Data.SqlClient.SqlCommand
Dim reader As Data.SqlClient.SqlDataReader


But currently my date get displayed as "2008/06/30 12:00:00 AM" and i want to display it as "30 June 2008".

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C# - Net Interpret Date As The Previous Day When Assigned To A Date Field?

Mar 4, 2010

I have a date I'm reading from an API in the following format:2010-03-15T00:00:00-04:00

When assigned to a date datatype in C#/, it's displayed as:

3/14/2010 11:00:00 PM //Note 3/15 is being displayed as 3/14

why is this displayed as the previous day? Is there a name for the format above?

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Error When Field Is NULL

May 2, 2010

I using ADO to get som values from a SQL DB one off the fields can have the value NULL And if i use:

txtinfo.Text = RS(

Then i get an error.I have try with IS NULL - but that dosn't work

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Remove Row In CSV Where Field In Row Is Null?

Nov 1, 2010

how to delete row in a CSV file where there is a null value in a partcular column?  I am using VB.  There are three columns I am using Post Date, Account Number, and Credit Amount.  I want to delete all rows with null values in the Account Number column.  I am very new to VB, took one class. I am using the Microsoft.VisualBasic.FileIO.TextFieldParser?

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Test For Null Value Of A Field In An ADO Recordset?

Oct 24, 2010

Question is: How to test for null value of a field in an ADO recordset.Using Visual Studio 2010 Ultimate - VB.NET

ADO Connection to ODBC database

I am working with a table that contains about 10,000 records of which I need to do additional processing on about 1500. The records I need to process are qualified by the field'Cataloged' = True. The problem I have is the table allows for True, False or Null values (I have no direct control of the table to change from allowing Null) for the field I need to test.I run into errors when the value of the field is Null and need to figure out how to determine its Null state prior to trying to qualify the field as True or False value to prevent the errors.

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Dealing With A Null In A Varbinary Field

Aug 3, 2009

I'm trying to test a varbinary(max) field to see if it's null. I'm trying to figure out if it's a null or not in the select statement, hoping to avoid having to do this locally for every row of the returned dataset. This is the SQL I'm using,


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Display Null Value From SQL Image Field?

Dec 30, 2009

I use following codes to display image from sql server. [code]...

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Have A Field In A Datatable (dt) That Can Be Integer Or NULL?

Mar 1, 2010

I have a field in a datatable (dt) that can be integer or NULL.

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Setting First Field In A Combo Box To Null?

Oct 1, 2011

I have a databound ComboBox on my form. Is there any way that I can make the first field blank.

I can do this with a DropDownList in the HTML part of .Net but is there a way to do it for a ComboBox?

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SQL Record Search But Field Is Sometimes NULL?

Mar 2, 2010

I am trying to do a SQL query to see if an Address already exists in my database. My addresses are structure like this:


Sometimes line2 and line3 are NULL values in my database.I am using .NET TableAdapter and DataTable to make my query. When I try to pass in my line2 parameter (@line2) it is equal to a string with value = nothing. My database does not interpret this as NULL and says the records don't match, but I know they do? How do I pass in a string = nothing and have it compare to a NULL value in the database as being equal? I have tried string = DBNULL.value but won't compile.I have done similar comparisons with integers etc. using integer = Nullable (of integer) but this does not exist for strings.

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VS 2008 Put Null Value In A Field Number

May 15, 2009

I have in my DB a few number fields, but I would like put null values or empty values in some of this fields...

I had try this but without results:

If valorcolocardebito = 0 Then
valorcolocardebito = Nothing
End If


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Getting Null Value Of Hidden Field At Server-side

Feb 18, 2011

I am calling a Java-script function, in that i am passing the value of hidden field, that hidden field i want to use at server-side, but the value of hidden field is null.[code]...

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Insert Null Value From A Textbox At Numeric Field?

May 17, 2012

Why when I try to save a null value from textbox at sql server 0 is saved?

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Made Empty Or Null Field In Datagridview

Nov 15, 2009

I key-in data from textbox to datagridvie..........the date data the format datatable is:


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Select All Records Where A Field Is Null Using LINQ?

Jan 25, 2012

I've got a table that caches calculated values for certain dates. I want to use LINQ to select all rows where the calculated value fields are null.But when I use isNothing I get an error that LINQ can't translate this into T-SQL. Is there a way to select null values with link, like this...?

Dim var = From rec As Record In myDataContext.Records Where IsNothing(rec.calculatedValue) Select rec

Other posts on stackoverflow mostly discuss how to avoid or check for null values with LINQ.

Note: I can't just set cacluatedValue's default to -1 to flag records whose calculated value has not been set (and then select those records) because I run queries that sum/average the calculated values. Selecting nulls seems cleaner and less bug-prone.

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VB Expression For Finding Null Value In DataRow Field

Jan 29, 2010

I require the expression which determines if a Data Item in a DataRow is null.

Required Code

If MyDataSet.Tables("MyTable")Rows("MyRow").Item("CheckingItem") [IS NULL] Then
'[Do Something]
End If 

Attempted Code Resulting in Thrown Exceptions

I have attempted the following code which resulted in the exceptions posted under them. 

If CType(ds.Tables("MyTable").Rows(0).Item(2),System.String) = "" Then
Me.lblOutput.Text = "Good"
End If
System.InvalidCastException: Conversion from type 'DBNull' to type 'String' is not valid.

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Cannot Leave Field Null When Running Insert Statement

Jun 8, 2009

I have the following query that I use to create a new record in a database. If I leave any field on the form blank, for example, it throws the error "Memo.Lastname" cannot be a zero length string. Other than that the query executes appropriately.
Private Sub cmdSaveMemo_Click(ByVal sender As System.Object,
ByVal e As System.EventArgs) Handles cmdSaveMemo.Click
If Len(Me.txtMemoID.Text) <> 0 Then
[Code] .....

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DataRow Not Produced Via DataAdapter.Fill If A Field Is Null?

Apr 20, 2012

I there a way to set up my DataTable so a field (or all fields can allow nulls if you can't set just 1 field) so oIDbDataAdapter.Fill won't leave out DataRows where a field contains a null value?

Dim oSqlCommand As SqlClient.SqlCommand
Dim oIDbDataAdapter As System.Data.IDbDataAdapter
oSqlCommand = New System.Data.SqlClient.SqlCommand( _


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DateTimePicker Bound To Nullable DateTime Field But No Null?

Apr 7, 2010

I have a date time picker bould to a Nullable Datetime field in a sql server datatable. The ShowCheckBox option is set to true. If the user unchecks the checkbox on the datetimepicker I would like to the field to be set back to null in the DataTable. The default behaveour does not seem to do this and there is no specific event for the uncheck.

Private Sub dtpCertDate_ValueChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles dtpCertDate.ValueChanged
If dtpCertDate.Focused Then


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Insert NULL Into Database If Form Field Is Empty Using ASP.NET & VB?

Jan 18, 2011

I have a form and stored procedure that inserts the data from the form. It works fine except that if a field isn't filled in it doesn't insert a NULL into SQL it inserts "".

I've tried a few different ways but none seem to insert NULL, the one below still inserts "", can anyone point me in the right direction?

Here is the required part of the code, if you require more just let me know.

Dim rdr As SqlDataReader
Dim cmdInsert As SqlCommand = New SqlCommand()
cmdInsert.CommandText = "spPersonalDetailsInsert"


So if I enter nothing into address1 field it should write NULL to screen but it always writes NOT NULL. What does an empty form field equal? in classic ASP it was always "".

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Inserting Empty String Field As Null In Access?

Jan 4, 2012

I have a couple of textfields in a Windows form. One of these textfields is allowed to be NULL. When I enter a value for every field, it is all inserted, no problem. When I leave the field (txtGewicht) blank, I can't seem to be able to insert NULL in Access Database.

If Double.TryParse(txtGewicht.Text, 0) Then
klant.Gewicht = Double.Parse(txtGewicht.Text)


This is what I get:

"Cannot set column 'Gewicht' to NULL, please use DBNull instead"

So I changed 'Nothing' to DBNull.value, but it then tells me that System.DBNull cannot be converted to type Double.

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VS 2008 - How To Insert Null Value Into SQL Server DateTime Field

May 7, 2009

How can I achieve this. Insert Null Value into SQL Server DateTime Field?

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Pass A NULL In A Parameter To A DateTime Field In A Stored Procedure?

Mar 3, 2011

I have a stored procedure which updates a database using the parameters I supply but I'm having trouble passing a NULL to the stored procedure

The field I need to make NULL is a DateTime field

DB.Parameters.AddWithValue("@date", NULL)

This gives me the error 'NULL' is not declared. 'Null' constant is no longer supported; use 'System.DBNull' instead


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How To Set Value For Date To Null Or Nothing

Aug 30, 2009

I'm making a data application and using the data adapters, I created a query in the designer:
EmpActivities_TableAdapter.InsertQuery(IdTextBox.Text, ActivityComboBox.Text, DescriptionTextBox.Text, Cdate(adddate.text))
The question is how can I set the adddate to null or nothing and save it? I'm using SQL server for the data.

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.net - SQL Server NULL DATE?

Jan 12, 2012

How can i remove this in my crystal report . this value is showing if my date field in null . "1/1/1900 12:00:00 AM". I don't want to show thin is my report.I have two dates , case open date and case close date . if the case is not closed its showing this value so i want to remove this.I am using sqlsever.

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Add Date Not Null Validation In .NET?

Oct 24, 2009

This video shows how to add validation for a textbox:[URL]..what about date ? I can't make it work for date.

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Calendar And NULL Date

Jun 23, 2012

I am working with calendar inside GridView using VB. I have some NULL date on the DDBB. I can fix the problem using EVAL, but when I try to save the date from the calendar, I got an error telling me that their is no @variable declared.[code]Everything is fine but I got: Must declare the scalar variable "@tDate" trying to save.This is beacuse I'm not using Bind, but with BIND I cannot run checkDate.

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Change Date From Dd/mm/yy To Null?

Sep 15, 2011

i have a datetimepicker with showcheckbox properties set to true..

when there is date in database, the checkbox is checked..

but when the database is null, the checkbox is unchecked..

here's the code:

Sub checkeddate() 'to set DateTimePicker.check (compare from database)
'if db is not null, then CheckBox is checked
If IsDBNull(DataSet.Tables("AssetMaster").Rows.Item(curPosition).Item(19)) = False Then


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Date With Empty/null Value?

Jun 23, 2009

i have a date control on form ( and by default its value is current date. i want to make its value to null or empty so that no date is shown and user choose from the drop down date calendar.

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